Cisco 6800 Series Administration Manual page 116

Install a Key Expansion Module
Step 6
Align the new footstand into the slots in the phone and into the slots in the key expansion module. Press the
footstand firmly in place.
This step ensures that the phone and key expansion module remain connected at all times.
Step 7
Plug the LAN cable into the phone and into the LAN port.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
102
Phone Accessories